Center core seal for filter elements



Oct. 6, 1953 K. AHLIJIAN CENTER CORE SEAL FOR FILTER ELEMENTS Filed March 29, 1951 IN VEN TOR.

I I I Patented Oct. 6, 1953 UNITED STATES ,ATENTV yOFFICE.

Kirk .Ahlijiam Cranston, vIt. I., assignor to .Fram Corpora-tion, -a corporation of .Rhode Island Application March 29, 1951 ,S'era1iNo. 218.5235

This invention relates to a yiilter of the type frequently used for liquids such for instance Ias the lubricant for an internal .combustion iengine.

In the use of certain materials for filtering, expansion or contraction takes place and some diiiiculty is encountered in the sealing .of the filtering material as movement may occur along a center core.

One of the objects of this yinvention is to provide a cartridge which may maintain a sealed relationship at the ends of the core even though some expansion or contraction may occur.

Another object of the invention 'is to use the ltering material to seal vthe cartridge 'on the center-core.

Another object of the invention is to provide an arrangement so that none of the iilter material may contaminate the filtrate.

With these and other objects in View, the invention consists of certain novel features of construction as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is a sectional View of a filter showing my invention;

Fig. 2 is a perspective view on a smaller scale of one of the members of filtering material;

Fig. 3 is a perspective view on a scale similar to Fig. 2 of one of the end members which provides the sealed relation.

In proceeding with this invention, I provide a filter cartridge which may be inserted in a case which comprises a center core of metal on which there is assembled a plurality of lter members. The end members have a tight sealing engagement with the core while the intermediate members have an opening suiiiciently large so as to provide a chamber about the core. The core is reduced at a point spaced inwardly from its ends and along this reduced portion it is perforated. A covering of fabric extends along the reduced portion to cover the openings so as to prevent any particles of the filtering material from passing through the core openings through which the filtrate pas-ses. A piece of fabric, usually knitted, extends over the entire outer surface of the material and is tucked into the ends about the core so as to provide a support and a retainer for the filtering material.

With reference to the drawings, I designates a cylindrical case having an integral bottom II and a removable cover I 2 which engages a gasket I3 of soft material. A center tube I4 is secured to a flanged boss I5 welded in the bottom wall, which boss is provided with threads I6 for attachment to a drain conduit. The cover issecured inplace by a fscrew I1 having ra head I8 and eng-aging internal threads If9 ofthe center tube Ifil to hold thelcover in pla-ce. An inlet port is located at L20 with a boss 2i Aextending routwardly `therefrom and threaded as at 22 for the connection of an iinlet conduit. A drain plug 2-3may1be `located in the bottom wall for'drainage should it'be desirable to drain thecase.

A collar 24 having -a supporting ange 25 lis secured to the center tube I4 and provides a rest for the cartridge which is designated generally 26 and comprises a pluralitt7 of members 21 Of filtering material usually of Aa cellulosic nature such :as described inthe .Orr Patent No. 2,148,708, dated .February 12S, 1939. Each of these members 21 is cylindrical having a cylindrical opening 28. The members 21 are assembled with the openings 28 in registry and their outer surfaces also aligning and are cemented together at the juncture 29 as shown. A metal core 30 extends through the openings 28 and is of a size so as to be spaced from the walls of the opening 28 and provide an annular chamber 3I. This annular chamber is closed at the opposite ends by disc like members 32 as shown in Fig. 3 which are cylindrical with a cylindrical hole 33 of a size to tightly engage the core 30. This core along the portion which is engaged by the members 32 is smooth and will permit of the members 32 sliding along the core. At a point inwardly from the portion engaged by the members 32 at any position of sliding, the core is reduced in diameter as at 34 and a plurality of openings 35 are provided in this reduced portion. A fabric 36 is located in this reduced portion 34 and covers the openings 35 so that none of the filter material should it become loose from the cake 21 or 32 could enter the filtrate stream. vThese end members 32 are also cemented to the members Y 21 at the juncture 31 so as to substantially be one piece with the plurality of members of lter material.

A fabric of knitted material 40 i-s drawn over the outer surface of the members 21 and 32 and tucked into the center openings 33 as at 4I so that when the core is positioned through the members, it will hold this material securely in place. 'I'he core is flanged at its ends as at 42 so as to hold the members 21 and 32 assembled thereon and the fabric 4U in place. The core is also deiiected inwardly at its lower end 43 and also at its upper end 44 so as to tightly engage the center tube I4 and provide a sealed engagement therewith. The cartridge rests upon the ange 25 and is forced toward this flange by spring 45 which is assembled on the screw I1 which holds the cover in place. Should there be any expansion or contraction of the material 21 and 32, the spring will permit expansion by the slidingI of the sealing disc 32 at the upper end upwardly or should there be any contraction of the cartridge, there will be a sliding of this disc along the core by reason of the spring to maintain the parts in contact and maintain a sealed relation between the core and the iiltering material thereon. The cartridge is symetri-cal and either end may engage the flange 25.

In use, the liquid will enter at port 20, pass through the cartridge into chamber 3| thence through the fabric 36 through the openings 35 into the space 46 between the center tube and the core, and thence through opening 41 in the center tube and downwardly through the center tube and out at port I 6.

Iclaim:

1. A'lter cartridge comprising a tubular core for the reception of a center tube having perforations at locations spaced inwardly from its end portions, the unperforated end portion-.s being of uniform cylindrical diameter, a plurality of members of brous lter material each having a central opening of a size larger than the core assembled in contiguous relation with said openings registering and through which openings said core extends spaced from the walls of said openings, end members of fibrous filtering material having openings the walls of which snugly fit and contact said tubular core and contacting the ends of said plurality of members to close the ends of said space about the core, at least one of said end members being slidable along and contacting said core as the members expand or contract.

2. A lter cartridge as in claim 1 wherein an outer skin of porous fabric covers said members.

3. A filter cartridge as in claim 1 wherein an outer skin of knitted porous fabric covers said members.

4. A filter cartridge as in claim 1 wherein the perforations of said core are covered with a porous fabric material.

5. A lter cartridge as in claim 1 wherein said core is of reduced diameter intermediate its ends and said perforations are in said portion of reduced diameter and a porous fabric covers the openings in said core.

KIRK AHLIJIAN.

References Cited in the flle of this patent UNITED STATES PATENTS Number Name Date 739,146 Bommarius Sept. 15, 1903 1,930,209 Milkey Oct. 10, 1933 2,148,708 Orr Feb. 28, 1939 2,196,349 West Apr. 9, 1940 2,345,848 Winslow et a1. Apr. 4, 1944 2,367,745 Wicks Jan. 23, 1945 2,487,146 Lasky Nov. 8, 1949 2,514,366 Beyland July 11, 1950 2,554,016 Czarnecki, Jr May 22, 1951 2,575,995 Briggs et al Nov. 20, 1951 FOREIGN PATENTS Number Country Date 11,700 Great Britain July 17, 1897 

